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Only if your phone is a plain old analog phone that doesn't need AC. Most people have cordless nowadays, so the battery would be essentially a waste.
All telephones are analog. Only the data on the wireless signal from the base station to a handset is digital to employ any authentication and encryption protocol.
However, you're correct in the sense of only a "plain old analog phone"...meaning a corded telephone...would benefit from a backup battery.
I knew this was a fine-print scam when Cox started heavily pushing their backup batteries in the spring of 2018. First, it's a $30 battery. Second, Cox recommends a Field Tech to "professionally install" the $30-battery for an additional charge. Third, it's a proprietary $30-battery. Meaning, their $30-batteries will only fit specific telephone modems and are not available in retail stores. Fourth, the $30-battery is only warranted for one year. Fifth, Cox repeatedly warns to purchase "additional" $30-batteries as "reserve backup batteries."
It's just a campaign to buy, buy, buy. If I can't get 911 services during a power outage, I'll die peacefully knowing I didn't fall for this scam.
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